Finding the Fourth Proportional to 139,008.32, 191,690.88 and 123,646.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,008.32 : 191,690.88 = 123,646.40 : x
2. Step 2: Convert to fraction form
   139,008.32/191,690.88 = 123,646.40/x
3. Step 3: Cross multiply
   139,008.32x = 191,690.88 × 123,646.40
4. Step 4: Simplify right side
   139,008.32x = 23,701,887,224.83
5. Step 5: Solve for x
   x = 23,701,887,224.83/139,008.32
6. Step 6: Final answer
   x = 170,506.97