Finding the Fourth Proportional to 99,976.78, 137,967.94 and 54,654.95

Step by Step Solution

1. Step 1: Write the proportion equation
   99,976.78 : 137,967.94 = 54,654.95 : x
2. Step 2: Convert to fraction form
   99,976.78/137,967.94 = 54,654.95/x
3. Step 3: Cross multiply
   99,976.78x = 137,967.94 × 54,654.95
4. Step 4: Simplify right side
   99,976.78x = 7,540,631,275.54
5. Step 5: Solve for x
   x = 7,540,631,275.54/99,976.78
6. Step 6: Final answer
   x = 75,423.83