Finding the Fourth Proportional to 90,339.30, 124,773.21 and 85,090.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,339.30 : 124,773.21 = 85,090.50 : x
2. Step 2: Convert to fraction form
   90,339.30/124,773.21 = 85,090.50/x
3. Step 3: Cross multiply
   90,339.30x = 124,773.21 × 85,090.50
4. Step 4: Simplify right side
   90,339.30x = 10,617,014,825.51
5. Step 5: Solve for x
   x = 10,617,014,825.51/90,339.30
6. Step 6: Final answer
   x = 117,523.77