Finding the Fourth Proportional to 90,340.30, 124,774.59 and 85,091.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,340.30 : 124,774.59 = 85,091.50 : x
2. Step 2: Convert to fraction form
   90,340.30/124,774.59 = 85,091.50/x
3. Step 3: Cross multiply
   90,340.30x = 124,774.59 × 85,091.50
4. Step 4: Simplify right side
   90,340.30x = 10,617,257,024.99
5. Step 5: Solve for x
   x = 10,617,257,024.99/90,340.30
6. Step 6: Final answer
   x = 117,525.15