Finding the Fourth Proportional to 105,419.76, 145,485.72 and 60,722.16

Step by Step Solution

1. Step 1: Write the proportion equation
   105,419.76 : 145,485.72 = 60,722.16 : x
2. Step 2: Convert to fraction form
   105,419.76/145,485.72 = 60,722.16/x
3. Step 3: Cross multiply
   105,419.76x = 145,485.72 × 60,722.16
4. Step 4: Simplify right side
   105,419.76x = 8,834,207,167.56
5. Step 5: Solve for x
   x = 8,834,207,167.56/105,419.76
6. Step 6: Final answer
   x = 83,800.30