Finding the Fourth Proportional to 1,300.61, 1,951.63 and 478.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.61 : 1,951.63 = 478.77 : x
2. Step 2: Convert to fraction form
   1,300.61/1,951.63 = 478.77/x
3. Step 3: Cross multiply
   1,300.61x = 1,951.63 × 478.77
4. Step 4: Simplify right side
   1,300.61x = 934,373.38
5. Step 5: Solve for x
   x = 934,373.38/1,300.61
6. Step 6: Final answer
   x = 718.41