Finding the Fourth Proportional to 91,675.72, 137,481.72 and 43,638.40

Step by Step Solution

1. Step 1: Write the proportion equation
   91,675.72 : 137,481.72 = 43,638.40 : x
2. Step 2: Convert to fraction form
   91,675.72/137,481.72 = 43,638.40/x
3. Step 3: Cross multiply
   91,675.72x = 137,481.72 × 43,638.40
4. Step 4: Simplify right side
   91,675.72x = 5,999,482,290.05
5. Step 5: Solve for x
   x = 5,999,482,290.05/91,675.72
6. Step 6: Final answer
   x = 65,442.43