Finding the Fourth Proportional to 99,970.83, 137,959.41 and 54,648.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99,970.83 : 137,959.41 = 54,648.83 : x
2. Step 2: Convert to fraction form
   99,970.83/137,959.41 = 54,648.83/x
3. Step 3: Cross multiply
   99,970.83x = 137,959.41 × 54,648.83
4. Step 4: Simplify right side
   99,970.83x = 7,539,319,654.19
5. Step 5: Solve for x
   x = 7,539,319,654.19/99,970.83
6. Step 6: Final answer
   x = 75,415.20