Finding the Fourth Proportional to 2,953.31, 4,428.86 and 978.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,953.31 : 4,428.86 = 978.57 : x
2. Step 2: Convert to fraction form
   2,953.31/4,428.86 = 978.57/x
3. Step 3: Cross multiply
   2,953.31x = 4,428.86 × 978.57
4. Step 4: Simplify right side
   2,953.31x = 4,333,944.64
5. Step 5: Solve for x
   x = 4,333,944.64/2,953.31
6. Step 6: Final answer
   x = 1,467.49