Finding the Fourth Proportional to 13,155.79, 18,152.56 and 7,490.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,155.79 : 18,152.56 = 7,490.20 : x
2. Step 2: Convert to fraction form
   13,155.79/18,152.56 = 7,490.20/x
3. Step 3: Cross multiply
   13,155.79x = 18,152.56 × 7,490.20
4. Step 4: Simplify right side
   13,155.79x = 135,966,304.91
5. Step 5: Solve for x
   x = 135,966,304.91/13,155.79
6. Step 6: Final answer
   x = 10,335.09