Finding the Fourth Proportional to 2,927.02, 4,389.62 and 978.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,927.02 : 4,389.62 = 978.77 : x
2. Step 2: Convert to fraction form
   2,927.02/4,389.62 = 978.77/x
3. Step 3: Cross multiply
   2,927.02x = 4,389.62 × 978.77
4. Step 4: Simplify right side
   2,927.02x = 4,296,428.37
5. Step 5: Solve for x
   x = 4,296,428.37/2,927.02
6. Step 6: Final answer
   x = 1,467.85