Finding the Fourth Proportional to 83,978.90, 115,899.06 and 62,721.26

Step by Step Solution

1. Step 1: Write the proportion equation
   83,978.90 : 115,899.06 = 62,721.26 : x
2. Step 2: Convert to fraction form
   83,978.90/115,899.06 = 62,721.26/x
3. Step 3: Cross multiply
   83,978.90x = 115,899.06 × 62,721.26
4. Step 4: Simplify right side
   83,978.90x = 7,269,335,076.02
5. Step 5: Solve for x
   x = 7,269,335,076.02/83,978.90
6. Step 6: Final answer
   x = 86,561.45