Finding the Fourth Proportional to 1,678.71, 2,316.59 and 932.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.71 : 2,316.59 = 932.63 : x
2. Step 2: Convert to fraction form
   1,678.71/2,316.59 = 932.63/x
3. Step 3: Cross multiply
   1,678.71x = 2,316.59 × 932.63
4. Step 4: Simplify right side
   1,678.71x = 2,160,505.09
5. Step 5: Solve for x
   x = 2,160,505.09/1,678.71
6. Step 6: Final answer
   x = 1,287.00