Finding the Fourth Proportional to 128,116.17, 192,292.38 and 64,980.60

Step by Step Solution

1. Step 1: Write the proportion equation
   128,116.17 : 192,292.38 = 64,980.60 : x
2. Step 2: Convert to fraction form
   128,116.17/192,292.38 = 64,980.60/x
3. Step 3: Cross multiply
   128,116.17x = 192,292.38 × 64,980.60
4. Step 4: Simplify right side
   128,116.17x = 12,495,274,227.83
5. Step 5: Solve for x
   x = 12,495,274,227.83/128,116.17
6. Step 6: Final answer
   x = 97,530.81