Finding the Fourth Proportional to 100,072.72, 138,077.76 and 59,778.62

Step by Step Solution

1. Step 1: Write the proportion equation
   100,072.72 : 138,077.76 = 59,778.62 : x
2. Step 2: Convert to fraction form
   100,072.72/138,077.76 = 59,778.62/x
3. Step 3: Cross multiply
   100,072.72x = 138,077.76 × 59,778.62
4. Step 4: Simplify right side
   100,072.72x = 8,254,097,255.10
5. Step 5: Solve for x
   x = 8,254,097,255.10/100,072.72
6. Step 6: Final answer
   x = 82,480.99