Finding the Fourth Proportional to 76,176.55, 105,113.78 and 42,642.55

Step by Step Solution

1. Step 1: Write the proportion equation
   76,176.55 : 105,113.78 = 42,642.55 : x
2. Step 2: Convert to fraction form
   76,176.55/105,113.78 = 42,642.55/x
3. Step 3: Cross multiply
   76,176.55x = 105,113.78 × 42,642.55
4. Step 4: Simplify right side
   76,176.55x = 4,482,319,093.77
5. Step 5: Solve for x
   x = 4,482,319,093.77/76,176.55
6. Step 6: Final answer
   x = 58,841.20