Finding the Fourth Proportional to 1,051.95, 1,574.69 and 987.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.95 : 1,574.69 = 987.15 : x
2. Step 2: Convert to fraction form
   1,051.95/1,574.69 = 987.15/x
3. Step 3: Cross multiply
   1,051.95x = 1,574.69 × 987.15
4. Step 4: Simplify right side
   1,051.95x = 1,554,450.30
5. Step 5: Solve for x
   x = 1,554,450.30/1,051.95
6. Step 6: Final answer
   x = 1,477.68