Finding the Fourth Proportional to 76,402.37, 105,430.27 and 42,409.20

Step by Step Solution

1. Step 1: Write the proportion equation
   76,402.37 : 105,430.27 = 42,409.20 : x
2. Step 2: Convert to fraction form
   76,402.37/105,430.27 = 42,409.20/x
3. Step 3: Cross multiply
   76,402.37x = 105,430.27 × 42,409.20
4. Step 4: Simplify right side
   76,402.37x = 4,471,213,300.46
5. Step 5: Solve for x
   x = 4,471,213,300.46/76,402.37
6. Step 6: Final answer
   x = 58,521.92