Finding the Fourth Proportional to 139,171.17, 209,002.28 and 103,642.14

Step by Step Solution

1. Step 1: Write the proportion equation
   139,171.17 : 209,002.28 = 103,642.14 : x
2. Step 2: Convert to fraction form
   139,171.17/209,002.28 = 103,642.14/x
3. Step 3: Cross multiply
   139,171.17x = 209,002.28 × 103,642.14
4. Step 4: Simplify right side
   139,171.17x = 21,661,443,045.87
5. Step 5: Solve for x
   x = 21,661,443,045.87/139,171.17
6. Step 6: Final answer
   x = 155,646.05