Finding the Fourth Proportional to 209,090,763.48, 288,545,401.59 and 115,012,068.15

Step by Step Solution

1. Step 1: Write the proportion equation
   209,090,763.48 : 288,545,401.59 = 115,012,068.15 : x
2. Step 2: Convert to fraction form
   209,090,763.48/288,545,401.59 = 115,012,068.15/x
3. Step 3: Cross multiply
   209,090,763.48x = 288,545,401.59 × 115,012,068.15
4. Step 4: Simplify right side
   209,090,763.48x = 33,186,203,392,038,196
5. Step 5: Solve for x
   x = 33,186,203,392,038,196/209,090,763.48
6. Step 6: Final answer
   x = 158,716,735.45