Finding the Fourth Proportional to 13,071.57, 18,038.71 and 7,406.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,071.57 : 18,038.71 = 7,406.31 : x
2. Step 2: Convert to fraction form
   13,071.57/18,038.71 = 7,406.31/x
3. Step 3: Cross multiply
   13,071.57x = 18,038.71 × 7,406.31
4. Step 4: Simplify right side
   13,071.57x = 133,600,192.10
5. Step 5: Solve for x
   x = 133,600,192.10/13,071.57
6. Step 6: Final answer
   x = 10,220.67