Finding the Fourth Proportional to 139,070.10, 208,556.55 and 72,488.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,070.10 : 208,556.55 = 72,488.10 : x
2. Step 2: Convert to fraction form
   139,070.10/208,556.55 = 72,488.10/x
3. Step 3: Cross multiply
   139,070.10x = 208,556.55 × 72,488.10
4. Step 4: Simplify right side
   139,070.10x = 15,117,868,052.06
5. Step 5: Solve for x
   x = 15,117,868,052.06/139,070.10
6. Step 6: Final answer
   x = 108,706.82