Finding the Fourth Proportional to 87,672.09, 120,985.06 and 49,431.30

Step by Step Solution

1. Step 1: Write the proportion equation
   87,672.09 : 120,985.06 = 49,431.30 : x
2. Step 2: Convert to fraction form
   87,672.09/120,985.06 = 49,431.30/x
3. Step 3: Cross multiply
   87,672.09x = 120,985.06 × 49,431.30
4. Step 4: Simplify right side
   87,672.09x = 5,980,448,796.38
5. Step 5: Solve for x
   x = 5,980,448,796.38/87,672.09
6. Step 6: Final answer
   x = 68,213.83