Finding the Fourth Proportional to 76,411.29, 105,448.50 and 42,420.45

Step by Step Solution

1. Step 1: Write the proportion equation
   76,411.29 : 105,448.50 = 42,420.45 : x
2. Step 2: Convert to fraction form
   76,411.29/105,448.50 = 42,420.45/x
3. Step 3: Cross multiply
   76,411.29x = 105,448.50 × 42,420.45
4. Step 4: Simplify right side
   76,411.29x = 4,473,172,821.83
5. Step 5: Solve for x
   x = 4,473,172,821.83/76,411.29
6. Step 6: Final answer
   x = 58,540.73