Finding the Fourth Proportional to 1,553.00, 2,142.78 and 986.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.00 : 2,142.78 = 986.01 : x
2. Step 2: Convert to fraction form
   1,553.00/2,142.78 = 986.01/x
3. Step 3: Cross multiply
   1,553.00x = 2,142.78 × 986.01
4. Step 4: Simplify right side
   1,553.00x = 2,112,802.51
5. Step 5: Solve for x
   x = 2,112,802.51/1,553.00
6. Step 6: Final answer
   x = 1,360.47