Finding the Fourth Proportional to 76,605.01, 105,721.29 and 42,619.90

Step by Step Solution

1. Step 1: Write the proportion equation
   76,605.01 : 105,721.29 = 42,619.90 : x
2. Step 2: Convert to fraction form
   76,605.01/105,721.29 = 42,619.90/x
3. Step 3: Cross multiply
   76,605.01x = 105,721.29 × 42,619.90
4. Step 4: Simplify right side
   76,605.01x = 4,505,830,807.67
5. Step 5: Solve for x
   x = 4,505,830,807.67/76,605.01
6. Step 6: Final answer
   x = 58,819.01