Finding the Fourth Proportional to 139,315.56, 208,938.78 and 65,426.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,315.56 : 208,938.78 = 65,426.28 : x
2. Step 2: Convert to fraction form
   139,315.56/208,938.78 = 65,426.28/x
3. Step 3: Cross multiply
   139,315.56x = 208,938.78 × 65,426.28
4. Step 4: Simplify right side
   139,315.56x = 13,670,087,123.14
5. Step 5: Solve for x
   x = 13,670,087,123.14/139,315.56
6. Step 6: Final answer
   x = 98,123.19