Finding the Fourth Proportional to 2,130.47, 2,940.63 and 1,384.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,130.47 : 2,940.63 = 1,384.39 : x
2. Step 2: Convert to fraction form
   2,130.47/2,940.63 = 1,384.39/x
3. Step 3: Cross multiply
   2,130.47x = 2,940.63 × 1,384.39
4. Step 4: Simplify right side
   2,130.47x = 4,070,978.77
5. Step 5: Solve for x
   x = 4,070,978.77/2,130.47
6. Step 6: Final answer
   x = 1,910.84