Finding the Fourth Proportional to 1,385.48, 1,913.63 and 1,011.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.48 : 1,913.63 = 1,011.87 : x
2. Step 2: Convert to fraction form
   1,385.48/1,913.63 = 1,011.87/x
3. Step 3: Cross multiply
   1,385.48x = 1,913.63 × 1,011.87
4. Step 4: Simplify right side
   1,385.48x = 1,936,339.73
5. Step 5: Solve for x
   x = 1,936,339.73/1,385.48
6. Step 6: Final answer
   x = 1,397.59