Finding the Fourth Proportional to 57,075.86, 78,760.41 and 31,920.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,075.86 : 78,760.41 = 31,920.50 : x
2. Step 2: Convert to fraction form
   57,075.86/78,760.41 = 31,920.50/x
3. Step 3: Cross multiply
   57,075.86x = 78,760.41 × 31,920.50
4. Step 4: Simplify right side
   57,075.86x = 2,514,071,667.41
5. Step 5: Solve for x
   x = 2,514,071,667.41/57,075.86
6. Step 6: Final answer
   x = 44,047.90