Finding the Fourth Proportional to 56,930.80, 78,554.16 and 39,986.82

Step by Step Solution

1. Step 1: Write the proportion equation
   56,930.80 : 78,554.16 = 39,986.82 : x
2. Step 2: Convert to fraction form
   56,930.80/78,554.16 = 39,986.82/x
3. Step 3: Cross multiply
   56,930.80x = 78,554.16 × 39,986.82
4. Step 4: Simplify right side
   56,930.80x = 3,141,131,056.17
5. Step 5: Solve for x
   x = 3,141,131,056.17/56,930.80
6. Step 6: Final answer
   x = 55,174.55