Finding the Fourth Proportional to 1,404.76, 1,938.70 and 783.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.76 : 1,938.70 = 783.76 : x
2. Step 2: Convert to fraction form
   1,404.76/1,938.70 = 783.76/x
3. Step 3: Cross multiply
   1,404.76x = 1,938.70 × 783.76
4. Step 4: Simplify right side
   1,404.76x = 1,519,475.51
5. Step 5: Solve for x
   x = 1,519,475.51/1,404.76
6. Step 6: Final answer
   x = 1,081.66