Finding the Fourth Proportional to 139,892.05, 209,895.72 and 102,642.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,892.05 : 209,895.72 = 102,642.04 : x
2. Step 2: Convert to fraction form
   139,892.05/209,895.72 = 102,642.04/x
3. Step 3: Cross multiply
   139,892.05x = 209,895.72 × 102,642.04
4. Step 4: Simplify right side
   139,892.05x = 21,544,124,888.07
5. Step 5: Solve for x
   x = 21,544,124,888.07/139,892.05
6. Step 6: Final answer
   x = 154,005.36