Finding the Fourth Proportional to 76,569.89, 105,666.55 and 42,578.01

Step by Step Solution

1. Step 1: Write the proportion equation
   76,569.89 : 105,666.55 = 42,578.01 : x
2. Step 2: Convert to fraction form
   76,569.89/105,666.55 = 42,578.01/x
3. Step 3: Cross multiply
   76,569.89x = 105,666.55 × 42,578.01
4. Step 4: Simplify right side
   76,569.89x = 4,499,071,316.12
5. Step 5: Solve for x
   x = 4,499,071,316.12/76,569.89
6. Step 6: Final answer
   x = 58,757.71