Finding the Fourth Proportional to 9,102.50, 12,561.85 and 5,123.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,102.50 : 12,561.85 = 5,123.87 : x
2. Step 2: Convert to fraction form
   9,102.50/12,561.85 = 5,123.87/x
3. Step 3: Cross multiply
   9,102.50x = 12,561.85 × 5,123.87
4. Step 4: Simplify right side
   9,102.50x = 64,365,223.55
5. Step 5: Solve for x
   x = 64,365,223.55/9,102.50
6. Step 6: Final answer
   x = 7,071.16