Finding the Fourth Proportional to 371,085.92, 512,064.72 and 209,955.68

Step by Step Solution

1. Step 1: Write the proportion equation
   371,085.92 : 512,064.72 = 209,955.68 : x
2. Step 2: Convert to fraction form
   371,085.92/512,064.72 = 209,955.68/x
3. Step 3: Cross multiply
   371,085.92x = 512,064.72 × 209,955.68
4. Step 4: Simplify right side
   371,085.92x = 107,510,896,491.61
5. Step 5: Solve for x
   x = 107,510,896,491.61/371,085.92
6. Step 6: Final answer
   x = 289,719.69