Finding the Fourth Proportional to 8,725.57, 13,071.83 and 5,157

Step by Step Solution

1. Step 1: Write the proportion equation
   8,725.57 : 13,071.83 = 5,157 : x
2. Step 2: Convert to fraction form
   8,725.57/13,071.83 = 5,157/x
3. Step 3: Cross multiply
   8,725.57x = 13,071.83 × 5,157
4. Step 4: Simplify right side
   8,725.57x = 67,411,401.53
5. Step 5: Solve for x
   x = 67,411,401.53/8,725.57
6. Step 6: Final answer
   x = 7,725.73