Finding the Fourth Proportional to 91,426.86, 137,181.06 and 58,138.20

Step by Step Solution

1. Step 1: Write the proportion equation
   91,426.86 : 137,181.06 = 58,138.20 : x
2. Step 2: Convert to fraction form
   91,426.86/137,181.06 = 58,138.20/x
3. Step 3: Cross multiply
   91,426.86x = 137,181.06 × 58,138.20
4. Step 4: Simplify right side
   91,426.86x = 7,975,459,902.49
5. Step 5: Solve for x
   x = 7,975,459,902.49/91,426.86
6. Step 6: Final answer
   x = 87,233.23