Finding the Fourth Proportional to 139,113.26, 208,599.72 and 99,109.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,113.26 : 208,599.72 = 99,109.40 : x
2. Step 2: Convert to fraction form
   139,113.26/208,599.72 = 99,109.40/x
3. Step 3: Cross multiply
   139,113.26x = 208,599.72 × 99,109.40
4. Step 4: Simplify right side
   139,113.26x = 20,674,193,089.37
5. Step 5: Solve for x
   x = 20,674,193,089.37/139,113.26
6. Step 6: Final answer
   x = 148,614.11