Finding the Fourth Proportional to 54,086.78, 74,690.88 and 51,141.62

Step by Step Solution

1. Step 1: Write the proportion equation
   54,086.78 : 74,690.88 = 51,141.62 : x
2. Step 2: Convert to fraction form
   54,086.78/74,690.88 = 51,141.62/x
3. Step 3: Cross multiply
   54,086.78x = 74,690.88 × 51,141.62
4. Step 4: Simplify right side
   54,086.78x = 3,819,812,602.43
5. Step 5: Solve for x
   x = 3,819,812,602.43/54,086.78
6. Step 6: Final answer
   x = 70,623.78