Finding the Fourth Proportional to 668,298.72, 1,002,116.43 and 212,830.59

Step by Step Solution

1. Step 1: Write the proportion equation
   668,298.72 : 1,002,116.43 = 212,830.59 : x
2. Step 2: Convert to fraction form
   668,298.72/1,002,116.43 = 212,830.59/x
3. Step 3: Cross multiply
   668,298.72x = 1,002,116.43 × 212,830.59
4. Step 4: Simplify right side
   668,298.72x = 213,281,031,045.59
5. Step 5: Solve for x
   x = 213,281,031,045.59/668,298.72
6. Step 6: Final answer
   x = 319,140.27