Finding the Fourth Proportional to 9,102.48, 12,561.20 and 5,123.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,102.48 : 12,561.20 = 5,123.64 : x
2. Step 2: Convert to fraction form
   9,102.48/12,561.20 = 5,123.64/x
3. Step 3: Cross multiply
   9,102.48x = 12,561.20 × 5,123.64
4. Step 4: Simplify right side
   9,102.48x = 64,359,066.77
5. Step 5: Solve for x
   x = 64,359,066.77/9,102.48
6. Step 6: Final answer
   x = 7,070.50