Finding the Fourth Proportional to 9,102.87, 12,561.89 and 5,123.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,102.87 : 12,561.89 = 5,123.79 : x
2. Step 2: Convert to fraction form
   9,102.87/12,561.89 = 5,123.79/x
3. Step 3: Cross multiply
   9,102.87x = 12,561.89 × 5,123.79
4. Step 4: Simplify right side
   9,102.87x = 64,364,460.74
5. Step 5: Solve for x
   x = 64,364,460.74/9,102.87
6. Step 6: Final answer
   x = 7,070.79