Finding the Fourth Proportional to 76,401.24, 105,428.42 and 42,407.06

Step by Step Solution

1. Step 1: Write the proportion equation
   76,401.24 : 105,428.42 = 42,407.06 : x
2. Step 2: Convert to fraction form
   76,401.24/105,428.42 = 42,407.06/x
3. Step 3: Cross multiply
   76,401.24x = 105,428.42 × 42,407.06
4. Step 4: Simplify right side
   76,401.24x = 4,470,908,593.47
5. Step 5: Solve for x
   x = 4,470,908,593.47/76,401.24
6. Step 6: Final answer
   x = 58,518.80