Finding the Fourth Proportional to 56,515.20, 77,940.27 and 42,209.69

Step by Step Solution

1. Step 1: Write the proportion equation
   56,515.20 : 77,940.27 = 42,209.69 : x
2. Step 2: Convert to fraction form
   56,515.20/77,940.27 = 42,209.69/x
3. Step 3: Cross multiply
   56,515.20x = 77,940.27 × 42,209.69
4. Step 4: Simplify right side
   56,515.20x = 3,289,834,245.51
5. Step 5: Solve for x
   x = 3,289,834,245.51/56,515.20
6. Step 6: Final answer
   x = 58,211.49