Finding the Fourth Proportional to 13,102.31, 18,081.52 and 7,134.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,102.31 : 18,081.52 = 7,134.31 : x
2. Step 2: Convert to fraction form
   13,102.31/18,081.52 = 7,134.31/x
3. Step 3: Cross multiply
   13,102.31x = 18,081.52 × 7,134.31
4. Step 4: Simplify right side
   13,102.31x = 128,999,173.72
5. Step 5: Solve for x
   x = 128,999,173.72/13,102.31
6. Step 6: Final answer
   x = 9,845.53