Finding the Fourth Proportional to 138,574.16, 191,314.96 and 90,910.34

Step by Step Solution

1. Step 1: Write the proportion equation
   138,574.16 : 191,314.96 = 90,910.34 : x
2. Step 2: Convert to fraction form
   138,574.16/191,314.96 = 90,910.34/x
3. Step 3: Cross multiply
   138,574.16x = 191,314.96 × 90,910.34
4. Step 4: Simplify right side
   138,574.16x = 17,392,508,060.69
5. Step 5: Solve for x
   x = 17,392,508,060.69/138,574.16
6. Step 6: Final answer
   x = 125,510.47