Finding the Fourth Proportional to 128,614.78, 177,488.53 and 72,026.15

Step by Step Solution

1. Step 1: Write the proportion equation
   128,614.78 : 177,488.53 = 72,026.15 : x
2. Step 2: Convert to fraction form
   128,614.78/177,488.53 = 72,026.15/x
3. Step 3: Cross multiply
   128,614.78x = 177,488.53 × 72,026.15
4. Step 4: Simplify right side
   128,614.78x = 12,783,815,485.06
5. Step 5: Solve for x
   x = 12,783,815,485.06/128,614.78
6. Step 6: Final answer
   x = 99,396.17