Finding the Fourth Proportional to 309,726.72, 464,875.20 and 191,628.72

Step by Step Solution

1. Step 1: Write the proportion equation
   309,726.72 : 464,875.20 = 191,628.72 : x
2. Step 2: Convert to fraction form
   309,726.72/464,875.20 = 191,628.72/x
3. Step 3: Cross multiply
   309,726.72x = 464,875.20 × 191,628.72
4. Step 4: Simplify right side
   309,726.72x = 89,083,439,535.74
5. Step 5: Solve for x
   x = 89,083,439,535.74/309,726.72
6. Step 6: Final answer
   x = 287,619.48