Finding the Fourth Proportional to 39,999.30, 55,141.98 and 31,030.98

Step by Step Solution

1. Step 1: Write the proportion equation
   39,999.30 : 55,141.98 = 31,030.98 : x
2. Step 2: Convert to fraction form
   39,999.30/55,141.98 = 31,030.98/x
3. Step 3: Cross multiply
   39,999.30x = 55,141.98 × 31,030.98
4. Step 4: Simplify right side
   39,999.30x = 1,711,109,678.54
5. Step 5: Solve for x
   x = 1,711,109,678.54/39,999.30
6. Step 6: Final answer
   x = 42,778.49