Finding the Fourth Proportional to 216,099.82, 298,256.78 and 128,890.52

Step by Step Solution

1. Step 1: Write the proportion equation
   216,099.82 : 298,256.78 = 128,890.52 : x
2. Step 2: Convert to fraction form
   216,099.82/298,256.78 = 128,890.52/x
3. Step 3: Cross multiply
   216,099.82x = 298,256.78 × 128,890.52
4. Step 4: Simplify right side
   216,099.82x = 38,442,470,298.67
5. Step 5: Solve for x
   x = 38,442,470,298.67/216,099.82
6. Step 6: Final answer
   x = 177,892.19