Finding the Fourth Proportional to 156,406.72, 215,858.64 and 89,338.72

Step by Step Solution

1. Step 1: Write the proportion equation
   156,406.72 : 215,858.64 = 89,338.72 : x
2. Step 2: Convert to fraction form
   156,406.72/215,858.64 = 89,338.72/x
3. Step 3: Cross multiply
   156,406.72x = 215,858.64 × 89,338.72
4. Step 4: Simplify right side
   156,406.72x = 19,284,534,598.54
5. Step 5: Solve for x
   x = 19,284,534,598.54/156,406.72
6. Step 6: Final answer
   x = 123,297.35