Finding the Fourth Proportional to 191,906.72, 287,717.90 and 91,971.76

Step by Step Solution

1. Step 1: Write the proportion equation
   191,906.72 : 287,717.90 = 91,971.76 : x
2. Step 2: Convert to fraction form
   191,906.72/287,717.90 = 91,971.76/x
3. Step 3: Cross multiply
   191,906.72x = 287,717.90 × 91,971.76
4. Step 4: Simplify right side
   191,906.72x = 26,461,921,646.50
5. Step 5: Solve for x
   x = 26,461,921,646.50/191,906.72
6. Step 6: Final answer
   x = 137,889.50