Finding the Fourth Proportional to 13,156.42, 18,155.98 and 7,490.90

Step by Step Solution

1. Step 1: Write the proportion equation
   13,156.42 : 18,155.98 = 7,490.90 : x
2. Step 2: Convert to fraction form
   13,156.42/18,155.98 = 7,490.90/x
3. Step 3: Cross multiply
   13,156.42x = 18,155.98 × 7,490.90
4. Step 4: Simplify right side
   13,156.42x = 136,004,630.58
5. Step 5: Solve for x
   x = 136,004,630.58/13,156.42
6. Step 6: Final answer
   x = 10,337.51