Finding the Fourth Proportional to 105,470.34, 145,549.30 and 57,726.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105,470.34 : 145,549.30 = 57,726.76 : x
2. Step 2: Convert to fraction form
   105,470.34/145,549.30 = 57,726.76/x
3. Step 3: Cross multiply
   105,470.34x = 145,549.30 × 57,726.76
4. Step 4: Simplify right side
   105,470.34x = 8,402,089,509.27
5. Step 5: Solve for x
   x = 8,402,089,509.27/105,470.34
6. Step 6: Final answer
   x = 79,663.06