Finding the Fourth Proportional to 99,419.80, 137,199.24 and 54,097.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,419.80 : 137,199.24 = 54,097.72 : x
2. Step 2: Convert to fraction form
   99,419.80/137,199.24 = 54,097.72/x
3. Step 3: Cross multiply
   99,419.80x = 137,199.24 × 54,097.72
4. Step 4: Simplify right side
   99,419.80x = 7,422,166,069.73
5. Step 5: Solve for x
   x = 7,422,166,069.73/99,419.80
6. Step 6: Final answer
   x = 74,654.81