Finding the Fourth Proportional to 221,061.54, 305,204.28 and 156,667.34

Step by Step Solution

1. Step 1: Write the proportion equation
   221,061.54 : 305,204.28 = 156,667.34 : x
2. Step 2: Convert to fraction form
   221,061.54/305,204.28 = 156,667.34/x
3. Step 3: Cross multiply
   221,061.54x = 305,204.28 × 156,667.34
4. Step 4: Simplify right side
   221,061.54x = 47,815,542,704.22
5. Step 5: Solve for x
   x = 47,815,542,704.22/221,061.54
6. Step 6: Final answer
   x = 216,299.69