Finding the Fourth Proportional to 156.56, 215.98 and 101.30

Step by Step Solution

1. Step 1: Write the proportion equation
   156.56 : 215.98 = 101.30 : x
2. Step 2: Convert to fraction form
   156.56/215.98 = 101.30/x
3. Step 3: Cross multiply
   156.56x = 215.98 × 101.30
4. Step 4: Simplify right side
   156.56x = 21,878.77
5. Step 5: Solve for x
   x = 21,878.77/156.56
6. Step 6: Final answer
   x = 139.75