Finding the Fourth Proportional to 505,155.51, 697,111.18 and 278,801.01

Step by Step Solution

1. Step 1: Write the proportion equation
   505,155.51 : 697,111.18 = 278,801.01 : x
2. Step 2: Convert to fraction form
   505,155.51/697,111.18 = 278,801.01/x
3. Step 3: Cross multiply
   505,155.51x = 697,111.18 × 278,801.01
4. Step 4: Simplify right side
   505,155.51x = 194,355,300,369.29
5. Step 5: Solve for x
   x = 194,355,300,369.29/505,155.51
6. Step 6: Final answer
   x = 384,743.50