Finding the Fourth Proportional to 138,071.72, 190,355.46 and 90,242.84

Step by Step Solution

1. Step 1: Write the proportion equation
   138,071.72 : 190,355.46 = 90,242.84 : x
2. Step 2: Convert to fraction form
   138,071.72/190,355.46 = 90,242.84/x
3. Step 3: Cross multiply
   138,071.72x = 190,355.46 × 90,242.84
4. Step 4: Simplify right side
   138,071.72x = 17,178,217,319.91
5. Step 5: Solve for x
   x = 17,178,217,319.91/138,071.72
6. Step 6: Final answer
   x = 124,415.18