Finding the Fourth Proportional to 87,999, 121,437.89 and 49,766.05

Step by Step Solution

1. Step 1: Write the proportion equation
   87,999 : 121,437.89 = 49,766.05 : x
2. Step 2: Convert to fraction form
   87,999/121,437.89 = 49,766.05/x
3. Step 3: Cross multiply
   87,999x = 121,437.89 × 49,766.05
4. Step 4: Simplify right side
   87,999x = 6,043,484,105.63
5. Step 5: Solve for x
   x = 6,043,484,105.63/87,999
6. Step 6: Final answer
   x = 68,676.74