Finding the Fourth Proportional to 285,116,320.72, 393,460,522.62 and 154,736,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   285,116,320.72 : 393,460,522.62 = 154,736,128.72 : x
2. Step 2: Convert to fraction form
   285,116,320.72/393,460,522.62 = 154,736,128.72/x
3. Step 3: Cross multiply
   285,116,320.72x = 393,460,522.62 × 154,736,128.72
4. Step 4: Simplify right side
   285,116,320.72x = 60,882,558,074,366,792
5. Step 5: Solve for x
   x = 60,882,558,074,366,792/285,116,320.72
6. Step 6: Final answer
   x = 213,535,857.65