Finding the Fourth Proportional to 9,102.31, 12,561.21 and 5,123.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,102.31 : 12,561.21 = 5,123.48 : x
2. Step 2: Convert to fraction form
   9,102.31/12,561.21 = 5,123.48/x
3. Step 3: Cross multiply
   9,102.31x = 12,561.21 × 5,123.48
4. Step 4: Simplify right side
   9,102.31x = 64,357,108.21
5. Step 5: Solve for x
   x = 64,357,108.21/9,102.31
6. Step 6: Final answer
   x = 7,070.41