Finding the Fourth Proportional to 1,384.01, 1,907.30 and 990.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.01 : 1,907.30 = 990.35 : x
2. Step 2: Convert to fraction form
   1,384.01/1,907.30 = 990.35/x
3. Step 3: Cross multiply
   1,384.01x = 1,907.30 × 990.35
4. Step 4: Simplify right side
   1,384.01x = 1,888,894.56
5. Step 5: Solve for x
   x = 1,888,894.56/1,384.01
6. Step 6: Final answer
   x = 1,364.80