Finding the Fourth Proportional to 76,870.62, 106,082.06 and 42,878.57

Step by Step Solution

1. Step 1: Write the proportion equation
   76,870.62 : 106,082.06 = 42,878.57 : x
2. Step 2: Convert to fraction form
   76,870.62/106,082.06 = 42,878.57/x
3. Step 3: Cross multiply
   76,870.62x = 106,082.06 × 42,878.57
4. Step 4: Simplify right side
   76,870.62x = 4,548,646,290.65
5. Step 5: Solve for x
   x = 4,548,646,290.65/76,870.62
6. Step 6: Final answer
   x = 59,172.75