Finding the Fourth Proportional to 1,384.89, 1,911.15 and 763.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.89 : 1,911.15 = 763.89 : x
2. Step 2: Convert to fraction form
   1,384.89/1,911.15 = 763.89/x
3. Step 3: Cross multiply
   1,384.89x = 1,911.15 × 763.89
4. Step 4: Simplify right side
   1,384.89x = 1,459,908.37
5. Step 5: Solve for x
   x = 1,459,908.37/1,384.89
6. Step 6: Final answer
   x = 1,054.17