Finding the Fourth Proportional to 99,812.72, 137,743.72 and 54,492.62

Step by Step Solution

1. Step 1: Write the proportion equation
   99,812.72 : 137,743.72 = 54,492.62 : x
2. Step 2: Convert to fraction form
   99,812.72/137,743.72 = 54,492.62/x
3. Step 3: Cross multiply
   99,812.72x = 137,743.72 × 54,492.62
4. Step 4: Simplify right side
   99,812.72x = 7,506,015,366.40
5. Step 5: Solve for x
   x = 7,506,015,366.40/99,812.72
6. Step 6: Final answer
   x = 75,200.99