Finding the Fourth Proportional to 76,393.79, 105,421.42 and 42,402.19

Step by Step Solution

1. Step 1: Write the proportion equation
   76,393.79 : 105,421.42 = 42,402.19 : x
2. Step 2: Convert to fraction form
   76,393.79/105,421.42 = 42,402.19/x
3. Step 3: Cross multiply
   76,393.79x = 105,421.42 × 42,402.19
4. Step 4: Simplify right side
   76,393.79x = 4,470,098,868.90
5. Step 5: Solve for x
   x = 4,470,098,868.90/76,393.79
6. Step 6: Final answer
   x = 58,513.90