Finding the Fourth Proportional to 99,980.84, 137,973.54 and 54,659.02

Step by Step Solution

1. Step 1: Write the proportion equation
   99,980.84 : 137,973.54 = 54,659.02 : x
2. Step 2: Convert to fraction form
   99,980.84/137,973.54 = 54,659.02/x
3. Step 3: Cross multiply
   99,980.84x = 137,973.54 × 54,659.02
4. Step 4: Simplify right side
   99,980.84x = 7,541,498,482.33
5. Step 5: Solve for x
   x = 7,541,498,482.33/99,980.84
6. Step 6: Final answer
   x = 75,429.44