Finding the Fourth Proportional to 71,827.32, 99,123.30 and 39,999.18

Step by Step Solution

1. Step 1: Write the proportion equation
   71,827.32 : 99,123.30 = 39,999.18 : x
2. Step 2: Convert to fraction form
   71,827.32/99,123.30 = 39,999.18/x
3. Step 3: Cross multiply
   71,827.32x = 99,123.30 × 39,999.18
4. Step 4: Simplify right side
   71,827.32x = 3,964,850,718.89
5. Step 5: Solve for x
   x = 3,964,850,718.89/71,827.32
6. Step 6: Final answer
   x = 55,199.76