Finding the Fourth Proportional to 99,620.31, 137,474.82 and 54,298.15

Step by Step Solution

1. Step 1: Write the proportion equation
   99,620.31 : 137,474.82 = 54,298.15 : x
2. Step 2: Convert to fraction form
   99,620.31/137,474.82 = 54,298.15/x
3. Step 3: Cross multiply
   99,620.31x = 137,474.82 × 54,298.15
4. Step 4: Simplify right side
   99,620.31x = 7,464,628,126.09
5. Step 5: Solve for x
   x = 7,464,628,126.09/99,620.31
6. Step 6: Final answer
   x = 74,930.79