Finding the Fourth Proportional to 9,129.31, 12,598.35 and 5,151.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,129.31 : 12,598.35 = 5,151.71 : x
2. Step 2: Convert to fraction form
   9,129.31/12,598.35 = 5,151.71/x
3. Step 3: Cross multiply
   9,129.31x = 12,598.35 × 5,151.71
4. Step 4: Simplify right side
   9,129.31x = 64,903,045.68
5. Step 5: Solve for x
   x = 64,903,045.68/9,129.31
6. Step 6: Final answer
   x = 7,109.30