Finding the Fourth Proportional to 76,398.74, 105,429.45 and 42,407.53

Step by Step Solution

1. Step 1: Write the proportion equation
   76,398.74 : 105,429.45 = 42,407.53 : x
2. Step 2: Convert to fraction form
   76,398.74/105,429.45 = 42,407.53/x
3. Step 3: Cross multiply
   76,398.74x = 105,429.45 × 42,407.53
4. Step 4: Simplify right side
   76,398.74x = 4,471,002,300.18
5. Step 5: Solve for x
   x = 4,471,002,300.18/76,398.74
6. Step 6: Final answer
   x = 58,521.94