Finding the Fourth Proportional to 139,051.84, 191,789.58 and 91,287.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,051.84 : 191,789.58 = 91,287.76 : x
2. Step 2: Convert to fraction form
   139,051.84/191,789.58 = 91,287.76/x
3. Step 3: Cross multiply
   139,051.84x = 191,789.58 × 91,287.76
4. Step 4: Simplify right side
   139,051.84x = 17,508,041,149.54
5. Step 5: Solve for x
   x = 17,508,041,149.54/139,051.84
6. Step 6: Final answer
   x = 125,910.17