Finding the Fourth Proportional to 139,111.29, 208,961.98 and 131,012.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139,111.29 : 208,961.98 = 131,012.91 : x
2. Step 2: Convert to fraction form
   139,111.29/208,961.98 = 131,012.91/x
3. Step 3: Cross multiply
   139,111.29x = 208,961.98 × 131,012.91
4. Step 4: Simplify right side
   139,111.29x = 27,376,716,751.63
5. Step 5: Solve for x
   x = 27,376,716,751.63/139,111.29
6. Step 6: Final answer
   x = 196,797.23