Finding the Fourth Proportional to 139,798.48, 209,490.34 and 102,681.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,798.48 : 209,490.34 = 102,681.04 : x
2. Step 2: Convert to fraction form
   139,798.48/209,490.34 = 102,681.04/x
3. Step 3: Cross multiply
   139,798.48x = 209,490.34 × 102,681.04
4. Step 4: Simplify right side
   139,798.48x = 21,510,685,981.15
5. Step 5: Solve for x
   x = 21,510,685,981.15/139,798.48
6. Step 6: Final answer
   x = 153,869.24