Finding the Fourth Proportional to 78,980.72, 108,962.20 and 45,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,980.72 : 108,962.20 = 45,428.72 : x
2. Step 2: Convert to fraction form
   78,980.72/108,962.20 = 45,428.72/x
3. Step 3: Cross multiply
   78,980.72x = 108,962.20 × 45,428.72
4. Step 4: Simplify right side
   78,980.72x = 4,950,013,274.38
5. Step 5: Solve for x
   x = 4,950,013,274.38/78,980.72
6. Step 6: Final answer
   x = 62,673.69