Finding the Fourth Proportional to 1,938.72, 2,909.34 and 784.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,938.72 : 2,909.34 = 784.56 : x
2. Step 2: Convert to fraction form
   1,938.72/2,909.34 = 784.56/x
3. Step 3: Cross multiply
   1,938.72x = 2,909.34 × 784.56
4. Step 4: Simplify right side
   1,938.72x = 2,282,551.79
5. Step 5: Solve for x
   x = 2,282,551.79/1,938.72
6. Step 6: Final answer
   x = 1,177.35