Finding the Fourth Proportional to 978,048.10, 1,467,072.15 and 417,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   978,048.10 : 1,467,072.15 = 417,139.30 : x
2. Step 2: Convert to fraction form
   978,048.10/1,467,072.15 = 417,139.30/x
3. Step 3: Cross multiply
   978,048.10x = 1,467,072.15 × 417,139.30
4. Step 4: Simplify right side
   978,048.10x = 611,973,449,700.50
5. Step 5: Solve for x
   x = 611,973,449,700.50/978,048.10
6. Step 6: Final answer
   x = 625,708.95