Finding the Fourth Proportional to 88,688,085.96, 121,500,648.05 and 85,372,233.11

Step by Step Solution

1. Step 1: Write the proportion equation
   88,688,085.96 : 121,500,648.05 = 85,372,233.11 : x
2. Step 2: Convert to fraction form
   88,688,085.96/121,500,648.05 = 85,372,233.11/x
3. Step 3: Cross multiply
   88,688,085.96x = 121,500,648.05 × 85,372,233.11
4. Step 4: Simplify right side
   88,688,085.96x = 10,372,781,648,340,666
5. Step 5: Solve for x
   x = 10,372,781,648,340,666/88,688,085.96
6. Step 6: Final answer
   x = 116,958,005.53