Finding the Fourth Proportional to 76,199, 105,154.66 and 42,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,199 : 105,154.66 = 42,665.72 : x
2. Step 2: Convert to fraction form
   76,199/105,154.66 = 42,665.72/x
3. Step 3: Cross multiply
   76,199x = 105,154.66 × 42,665.72
4. Step 4: Simplify right side
   76,199x = 4,486,499,280.26
5. Step 5: Solve for x
   x = 4,486,499,280.26/76,199
6. Step 6: Final answer
   x = 58,878.72