Finding the Fourth Proportional to 56,814.31, 78,409.29 and 42,449.21

Step by Step Solution

1. Step 1: Write the proportion equation
   56,814.31 : 78,409.29 = 42,449.21 : x
2. Step 2: Convert to fraction form
   56,814.31/78,409.29 = 42,449.21/x
3. Step 3: Cross multiply
   56,814.31x = 78,409.29 × 42,449.21
4. Step 4: Simplify right side
   56,814.31x = 3,328,412,800.00
5. Step 5: Solve for x
   x = 3,328,412,800.00/56,814.31
6. Step 6: Final answer
   x = 58,584.06