Finding the Fourth Proportional to 1,384.86, 1,911.80 and 913.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.86 : 1,911.80 = 913.07 : x
2. Step 2: Convert to fraction form
   1,384.86/1,911.80 = 913.07/x
3. Step 3: Cross multiply
   1,384.86x = 1,911.80 × 913.07
4. Step 4: Simplify right side
   1,384.86x = 1,745,614.29
5. Step 5: Solve for x
   x = 1,745,614.29/1,384.86
6. Step 6: Final answer
   x = 1,260.50