Finding the Fourth Proportional to 56,645.15, 78,168.75 and 31,151.52

Step by Step Solution

1. Step 1: Write the proportion equation
   56,645.15 : 78,168.75 = 31,151.52 : x
2. Step 2: Convert to fraction form
   56,645.15/78,168.75 = 31,151.52/x
3. Step 3: Cross multiply
   56,645.15x = 78,168.75 × 31,151.52
4. Step 4: Simplify right side
   56,645.15x = 2,435,075,379
5. Step 5: Solve for x
   x = 2,435,075,379/56,645.15
6. Step 6: Final answer
   x = 42,988.24