Finding the Fourth Proportional to 13,124.58, 18,111.90 and 7,156.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.58 : 18,111.90 = 7,156.25 : x
2. Step 2: Convert to fraction form
   13,124.58/18,111.90 = 7,156.25/x
3. Step 3: Cross multiply
   13,124.58x = 18,111.90 × 7,156.25
4. Step 4: Simplify right side
   13,124.58x = 129,613,193.82
5. Step 5: Solve for x
   x = 129,613,193.82/13,124.58
6. Step 6: Final answer
   x = 9,875.61