Finding the Fourth Proportional to 520,061.10, 780,178.05 and 204,528.30

Step by Step Solution

1. Step 1: Write the proportion equation
   520,061.10 : 780,178.05 = 204,528.30 : x
2. Step 2: Convert to fraction form
   520,061.10/780,178.05 = 204,528.30/x
3. Step 3: Cross multiply
   520,061.10x = 780,178.05 × 204,528.30
4. Step 4: Simplify right side
   520,061.10x = 159,568,490,263.82
5. Step 5: Solve for x
   x = 159,568,490,263.82/520,061.10
6. Step 6: Final answer
   x = 306,826.43