Finding the Fourth Proportional to 139,987.34, 193,199.18 and 88,379.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,987.34 : 193,199.18 = 88,379.40 : x
2. Step 2: Convert to fraction form
   139,987.34/193,199.18 = 88,379.40/x
3. Step 3: Cross multiply
   139,987.34x = 193,199.18 × 88,379.40
4. Step 4: Simplify right side
   139,987.34x = 17,074,827,891.49
5. Step 5: Solve for x
   x = 17,074,827,891.49/139,987.34
6. Step 6: Final answer
   x = 121,974.09