Finding the Fourth Proportional to 99,705.59, 137,595.35 and 54,383.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99,705.59 : 137,595.35 = 54,383.57 : x
2. Step 2: Convert to fraction form
   99,705.59/137,595.35 = 54,383.57/x
3. Step 3: Cross multiply
   99,705.59x = 137,595.35 × 54,383.57
4. Step 4: Simplify right side
   99,705.59x = 7,482,925,388.50
5. Step 5: Solve for x
   x = 7,482,925,388.50/99,705.59
6. Step 6: Final answer
   x = 75,050.21