Finding the Fourth Proportional to 76,400.48, 105,427.38 and 42,407.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,400.48 : 105,427.38 = 42,407.72 : x
2. Step 2: Convert to fraction form
   76,400.48/105,427.38 = 42,407.72/x
3. Step 3: Cross multiply
   76,400.48x = 105,427.38 × 42,407.72
4. Step 4: Simplify right side
   76,400.48x = 4,470,934,811.37
5. Step 5: Solve for x
   x = 4,470,934,811.37/76,400.48
6. Step 6: Final answer
   x = 58,519.72