Finding the Fourth Proportional to 99,580.64, 137,419.54 and 54,259

Step by Step Solution

1. Step 1: Write the proportion equation
   99,580.64 : 137,419.54 = 54,259 : x
2. Step 2: Convert to fraction form
   99,580.64/137,419.54 = 54,259/x
3. Step 3: Cross multiply
   99,580.64x = 137,419.54 × 54,259
4. Step 4: Simplify right side
   99,580.64x = 7,456,246,820.86
5. Step 5: Solve for x
   x = 7,456,246,820.86/99,580.64
6. Step 6: Final answer
   x = 74,876.47