Finding the Fourth Proportional to 138,499.10, 191,451.63 and 123,540.02

Step by Step Solution

1. Step 1: Write the proportion equation
   138,499.10 : 191,451.63 = 123,540.02 : x
2. Step 2: Convert to fraction form
   138,499.10/191,451.63 = 123,540.02/x
3. Step 3: Cross multiply
   138,499.10x = 191,451.63 × 123,540.02
4. Step 4: Simplify right side
   138,499.10x = 23,651,938,199.23
5. Step 5: Solve for x
   x = 23,651,938,199.23/138,499.10
6. Step 6: Final answer
   x = 170,773.23