Finding the Fourth Proportional to 128,891.42, 193,336.78 and 72,706.02

Step by Step Solution

1. Step 1: Write the proportion equation
   128,891.42 : 193,336.78 = 72,706.02 : x
2. Step 2: Convert to fraction form
   128,891.42/193,336.78 = 72,706.02/x
3. Step 3: Cross multiply
   128,891.42x = 193,336.78 × 72,706.02
4. Step 4: Simplify right side
   128,891.42x = 14,056,747,429.89
5. Step 5: Solve for x
   x = 14,056,747,429.89/128,891.42
6. Step 6: Final answer
   x = 109,058.83