Finding the Fourth Proportional to 139,061.44, 191,834.13 and 87,988.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,061.44 : 191,834.13 = 87,988.06 : x
2. Step 2: Convert to fraction form
   139,061.44/191,834.13 = 87,988.06/x
3. Step 3: Cross multiply
   139,061.44x = 191,834.13 × 87,988.06
4. Step 4: Simplify right side
   139,061.44x = 16,879,112,940.49
5. Step 5: Solve for x
   x = 16,879,112,940.49/139,061.44
6. Step 6: Final answer
   x = 121,378.82