Finding the Fourth Proportional to 56,814.87, 78,410.07 and 42,449.78

Step by Step Solution

1. Step 1: Write the proportion equation
   56,814.87 : 78,410.07 = 42,449.78 : x
2. Step 2: Convert to fraction form
   56,814.87/78,410.07 = 42,449.78/x
3. Step 3: Cross multiply
   56,814.87x = 78,410.07 × 42,449.78
4. Step 4: Simplify right side
   56,814.87x = 3,328,489,976.25
5. Step 5: Solve for x
   x = 3,328,489,976.25/56,814.87
6. Step 6: Final answer
   x = 58,584.83