Finding the Fourth Proportional to 139,109.68, 208,661.28 and 75,991.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,109.68 : 208,661.28 = 75,991.24 : x
2. Step 2: Convert to fraction form
   139,109.68/208,661.28 = 75,991.24/x
3. Step 3: Cross multiply
   139,109.68x = 208,661.28 × 75,991.24
4. Step 4: Simplify right side
   139,109.68x = 15,856,429,407.19
5. Step 5: Solve for x
   x = 15,856,429,407.19/139,109.68
6. Step 6: Final answer
   x = 113,985.09