Finding the Fourth Proportional to 76,398.48, 105,424.62 and 42,405.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,398.48 : 105,424.62 = 42,405.72 : x
2. Step 2: Convert to fraction form
   76,398.48/105,424.62 = 42,405.72/x
3. Step 3: Cross multiply
   76,398.48x = 105,424.62 × 42,405.72
4. Step 4: Simplify right side
   76,398.48x = 4,470,606,916.83
5. Step 5: Solve for x
   x = 4,470,606,916.83/76,398.48
6. Step 6: Final answer
   x = 58,516.96