Finding the Fourth Proportional to 138,463.57, 208,128.89 and 91,381.22

Step by Step Solution

1. Step 1: Write the proportion equation
   138,463.57 : 208,128.89 = 91,381.22 : x
2. Step 2: Convert to fraction form
   138,463.57/208,128.89 = 91,381.22/x
3. Step 3: Cross multiply
   138,463.57x = 208,128.89 × 91,381.22
4. Step 4: Simplify right side
   138,463.57x = 19,019,071,885.45
5. Step 5: Solve for x
   x = 19,019,071,885.45/138,463.57
6. Step 6: Final answer
   x = 137,357.95