Finding the Fourth Proportional to 128,830.29, 177,852.74 and 100,085.82

Step by Step Solution

1. Step 1: Write the proportion equation
   128,830.29 : 177,852.74 = 100,085.82 : x
2. Step 2: Convert to fraction form
   128,830.29/177,852.74 = 100,085.82/x
3. Step 3: Cross multiply
   128,830.29x = 177,852.74 × 100,085.82
4. Step 4: Simplify right side
   128,830.29x = 17,800,536,821.72
5. Step 5: Solve for x
   x = 17,800,536,821.72/128,830.29
6. Step 6: Final answer
   x = 138,170.43