Finding the Fourth Proportional to 142,165.05, 213,305.57 and 91,590.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,165.05 : 213,305.57 = 91,590.50 : x
2. Step 2: Convert to fraction form
   142,165.05/213,305.57 = 91,590.50/x
3. Step 3: Cross multiply
   142,165.05x = 213,305.57 × 91,590.50
4. Step 4: Simplify right side
   142,165.05x = 19,536,762,284.60
5. Step 5: Solve for x
   x = 19,536,762,284.60/142,165.05
6. Step 6: Final answer
   x = 137,423.10