Finding the Fourth Proportional to 356,002.56, 533,920.78 and 103,215.21

Step by Step Solution

1. Step 1: Write the proportion equation
   356,002.56 : 533,920.78 = 103,215.21 : x
2. Step 2: Convert to fraction form
   356,002.56/533,920.78 = 103,215.21/x
3. Step 3: Cross multiply
   356,002.56x = 533,920.78 × 103,215.21
4. Step 4: Simplify right side
   356,002.56x = 55,108,742,245.38
5. Step 5: Solve for x
   x = 55,108,742,245.38/356,002.56
6. Step 6: Final answer
   x = 154,798.72