Finding the Fourth Proportional to 3,611.01, 5,416.05 and 978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,611.01 : 5,416.05 = 978.72 : x
2. Step 2: Convert to fraction form
   3,611.01/5,416.05 = 978.72/x
3. Step 3: Cross multiply
   3,611.01x = 5,416.05 × 978.72
4. Step 4: Simplify right side
   3,611.01x = 5,300,796.46
5. Step 5: Solve for x
   x = 5,300,796.46/3,611.01
6. Step 6: Final answer
   x = 1,467.95