Finding the Fourth Proportional to 271,618.98, 407,428.56 and 103,139.46

Step by Step Solution

1. Step 1: Write the proportion equation
   271,618.98 : 407,428.56 = 103,139.46 : x
2. Step 2: Convert to fraction form
   271,618.98/407,428.56 = 103,139.46/x
3. Step 3: Cross multiply
   271,618.98x = 407,428.56 × 103,139.46
4. Step 4: Simplify right side
   271,618.98x = 42,021,961,666.98
5. Step 5: Solve for x
   x = 42,021,961,666.98/271,618.98
6. Step 6: Final answer
   x = 154,709.22