Finding the Fourth Proportional to 123,990.78, 185,999.15 and 52,920.98

Step by Step Solution

1. Step 1: Write the proportion equation
   123,990.78 : 185,999.15 = 52,920.98 : x
2. Step 2: Convert to fraction form
   123,990.78/185,999.15 = 52,920.98/x
3. Step 3: Cross multiply
   123,990.78x = 185,999.15 × 52,920.98
4. Step 4: Simplify right side
   123,990.78x = 9,843,257,196.97
5. Step 5: Solve for x
   x = 9,843,257,196.97/123,990.78
6. Step 6: Final answer
   x = 79,387.01