Finding the Fourth Proportional to 156,835.82, 216,433 and 85,216.10

Step by Step Solution

1. Step 1: Write the proportion equation
   156,835.82 : 216,433 = 85,216.10 : x
2. Step 2: Convert to fraction form
   156,835.82/216,433 = 85,216.10/x
3. Step 3: Cross multiply
   156,835.82x = 216,433 × 85,216.10
4. Step 4: Simplify right side
   156,835.82x = 18,443,576,171.30
5. Step 5: Solve for x
   x = 18,443,576,171.30/156,835.82
6. Step 6: Final answer
   x = 117,597.98