Finding the Fourth Proportional to 9,102.65, 12,561.56 and 5,123.67

Step by Step Solution

1. Step 1: Write the proportion equation
   9,102.65 : 12,561.56 = 5,123.67 : x
2. Step 2: Convert to fraction form
   9,102.65/12,561.56 = 5,123.67/x
3. Step 3: Cross multiply
   9,102.65x = 12,561.56 × 5,123.67
4. Step 4: Simplify right side
   9,102.65x = 64,361,334.09
5. Step 5: Solve for x
   x = 64,361,334.09/9,102.65
6. Step 6: Final answer
   x = 7,070.62