Finding the Fourth Proportional to 209,061.95, 288,358.52 and 128,533.77

Step by Step Solution

1. Step 1: Write the proportion equation
   209,061.95 : 288,358.52 = 128,533.77 : x
2. Step 2: Convert to fraction form
   209,061.95/288,358.52 = 128,533.77/x
3. Step 3: Cross multiply
   209,061.95x = 288,358.52 × 128,533.77
4. Step 4: Simplify right side
   209,061.95x = 37,063,807,044.55
5. Step 5: Solve for x
   x = 37,063,807,044.55/209,061.95
6. Step 6: Final answer
   x = 177,286.24