Finding the Fourth Proportional to 9,102.31, 12,561.59 and 5,123.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,102.31 : 12,561.59 = 5,123.68 : x
2. Step 2: Convert to fraction form
   9,102.31/12,561.59 = 5,123.68/x
3. Step 3: Cross multiply
   9,102.31x = 12,561.59 × 5,123.68
4. Step 4: Simplify right side
   9,102.31x = 64,361,567.45
5. Step 5: Solve for x
   x = 64,361,567.45/9,102.31
6. Step 6: Final answer
   x = 7,070.90