Finding the Fourth Proportional to 1,399.77, 1,931.18 and 802.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.77 : 1,931.18 = 802.11 : x
2. Step 2: Convert to fraction form
   1,399.77/1,931.18 = 802.11/x
3. Step 3: Cross multiply
   1,399.77x = 1,931.18 × 802.11
4. Step 4: Simplify right side
   1,399.77x = 1,549,005.12
5. Step 5: Solve for x
   x = 1,549,005.12/1,399.77
6. Step 6: Final answer
   x = 1,106.61