Finding the Fourth Proportional to 290,045.18, 435,079.56 and 138,164.18

Step by Step Solution

1. Step 1: Write the proportion equation
   290,045.18 : 435,079.56 = 138,164.18 : x
2. Step 2: Convert to fraction form
   290,045.18/435,079.56 = 138,164.18/x
3. Step 3: Cross multiply
   290,045.18x = 435,079.56 × 138,164.18
4. Step 4: Simplify right side
   290,045.18x = 60,112,410,642.16
5. Step 5: Solve for x
   x = 60,112,410,642.16/290,045.18
6. Step 6: Final answer
   x = 207,251.89