Finding the Fourth Proportional to 91,480.18, 137,042.71 and 67,420.78

Step by Step Solution

1. Step 1: Write the proportion equation
   91,480.18 : 137,042.71 = 67,420.78 : x
2. Step 2: Convert to fraction form
   91,480.18/137,042.71 = 67,420.78/x
3. Step 3: Cross multiply
   91,480.18x = 137,042.71 × 67,420.78
4. Step 4: Simplify right side
   91,480.18x = 9,239,526,401.51
5. Step 5: Solve for x
   x = 9,239,526,401.51/91,480.18
6. Step 6: Final answer
   x = 101,000.31