Finding the Fourth Proportional to 76,980.38, 106,226.86 and 42,986.21

Step by Step Solution

1. Step 1: Write the proportion equation
   76,980.38 : 106,226.86 = 42,986.21 : x
2. Step 2: Convert to fraction form
   76,980.38/106,226.86 = 42,986.21/x
3. Step 3: Cross multiply
   76,980.38x = 106,226.86 × 42,986.21
4. Step 4: Simplify right side
   76,980.38x = 4,566,290,111.60
5. Step 5: Solve for x
   x = 4,566,290,111.60/76,980.38
6. Step 6: Final answer
   x = 59,317.58