Finding the Fourth Proportional to 213,401.34, 320,749.92 and 142,575.30

Step by Step Solution

1. Step 1: Write the proportion equation
   213,401.34 : 320,749.92 = 142,575.30 : x
2. Step 2: Convert to fraction form
   213,401.34/320,749.92 = 142,575.30/x
3. Step 3: Cross multiply
   213,401.34x = 320,749.92 × 142,575.30
4. Step 4: Simplify right side
   213,401.34x = 45,731,016,068.98
5. Step 5: Solve for x
   x = 45,731,016,068.98/213,401.34
6. Step 6: Final answer
   x = 214,295.82