Finding the Fourth Proportional to 128,597.98, 177,460.32 and 72,006.52

Step by Step Solution

1. Step 1: Write the proportion equation
   128,597.98 : 177,460.32 = 72,006.52 : x
2. Step 2: Convert to fraction form
   128,597.98/177,460.32 = 72,006.52/x
3. Step 3: Cross multiply
   128,597.98x = 177,460.32 × 72,006.52
4. Step 4: Simplify right side
   128,597.98x = 12,778,300,081.29
5. Step 5: Solve for x
   x = 12,778,300,081.29/128,597.98
6. Step 6: Final answer
   x = 99,366.26