Finding the Fourth Proportional to 699,082.57, 964,719.53 and 388,978.27

Step by Step Solution

1. Step 1: Write the proportion equation
   699,082.57 : 964,719.53 = 388,978.27 : x
2. Step 2: Convert to fraction form
   699,082.57/964,719.53 = 388,978.27/x
3. Step 3: Cross multiply
   699,082.57x = 964,719.53 × 388,978.27
4. Step 4: Simplify right side
   699,082.57x = 375,254,933,814.61
5. Step 5: Solve for x
   x = 375,254,933,814.61/699,082.57
6. Step 6: Final answer
   x = 536,781.99