Finding the Fourth Proportional to 83,978.88, 115,853.36 and 56,746.16

Step by Step Solution

1. Step 1: Write the proportion equation
   83,978.88 : 115,853.36 = 56,746.16 : x
2. Step 2: Convert to fraction form
   83,978.88/115,853.36 = 56,746.16/x
3. Step 3: Cross multiply
   83,978.88x = 115,853.36 × 56,746.16
4. Step 4: Simplify right side
   83,978.88x = 6,574,233,303.10
5. Step 5: Solve for x
   x = 6,574,233,303.10/83,978.88
6. Step 6: Final answer
   x = 78,284.37