Finding the Fourth Proportional to 56,643.07, 78,169.42 and 31,150.48

Step by Step Solution

1. Step 1: Write the proportion equation
   56,643.07 : 78,169.42 = 31,150.48 : x
2. Step 2: Convert to fraction form
   56,643.07/78,169.42 = 31,150.48/x
3. Step 3: Cross multiply
   56,643.07x = 78,169.42 × 31,150.48
4. Step 4: Simplify right side
   56,643.07x = 2,435,014,681.02
5. Step 5: Solve for x
   x = 2,435,014,681.02/56,643.07
6. Step 6: Final answer
   x = 42,988.75