Finding the Fourth Proportional to 82,110.72, 123,040.80 and 42,680.64

Step by Step Solution

1. Step 1: Write the proportion equation
   82,110.72 : 123,040.80 = 42,680.64 : x
2. Step 2: Convert to fraction form
   82,110.72/123,040.80 = 42,680.64/x
3. Step 3: Cross multiply
   82,110.72x = 123,040.80 × 42,680.64
4. Step 4: Simplify right side
   82,110.72x = 5,251,460,090.11
5. Step 5: Solve for x
   x = 5,251,460,090.11/82,110.72
6. Step 6: Final answer
   x = 63,955.84