Finding the Fourth Proportional to 156.47, 215.83 and 131.86

Step by Step Solution

1. Step 1: Write the proportion equation
   156.47 : 215.83 = 131.86 : x
2. Step 2: Convert to fraction form
   156.47/215.83 = 131.86/x
3. Step 3: Cross multiply
   156.47x = 215.83 × 131.86
4. Step 4: Simplify right side
   156.47x = 28,459.78
5. Step 5: Solve for x
   x = 28,459.78/156.47
6. Step 6: Final answer
   x = 181.89