Finding the Fourth Proportional to 71,779.49, 99,054.71 and 39,948.39

Step by Step Solution

1. Step 1: Write the proportion equation
   71,779.49 : 99,054.71 = 39,948.39 : x
2. Step 2: Convert to fraction form
   71,779.49/99,054.71 = 39,948.39/x
3. Step 3: Cross multiply
   71,779.49x = 99,054.71 × 39,948.39
4. Step 4: Simplify right side
   71,779.49x = 3,957,076,186.42
5. Step 5: Solve for x
   x = 3,957,076,186.42/71,779.49
6. Step 6: Final answer
   x = 55,128.23