Finding the Fourth Proportional to 520,667.10, 780,109.08 and 284,175.72

Step by Step Solution

1. Step 1: Write the proportion equation
   520,667.10 : 780,109.08 = 284,175.72 : x
2. Step 2: Convert to fraction form
   520,667.10/780,109.08 = 284,175.72/x
3. Step 3: Cross multiply
   520,667.10x = 780,109.08 × 284,175.72
4. Step 4: Simplify right side
   520,667.10x = 221,688,059,487.54
5. Step 5: Solve for x
   x = 221,688,059,487.54/520,667.10
6. Step 6: Final answer
   x = 425,776.97