Finding the Fourth Proportional to 99,978.30, 137,970.32 and 54,656.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99,978.30 : 137,970.32 = 54,656.82 : x
2. Step 2: Convert to fraction form
   99,978.30/137,970.32 = 54,656.82/x
3. Step 3: Cross multiply
   99,978.30x = 137,970.32 × 54,656.82
4. Step 4: Simplify right side
   99,978.30x = 7,541,018,672.30
5. Step 5: Solve for x
   x = 7,541,018,672.30/99,978.30
6. Step 6: Final answer
   x = 75,426.55