Finding the Fourth Proportional to 128,092.89, 191,983.52 and 90,663.76

Step by Step Solution

1. Step 1: Write the proportion equation
   128,092.89 : 191,983.52 = 90,663.76 : x
2. Step 2: Convert to fraction form
   128,092.89/191,983.52 = 90,663.76/x
3. Step 3: Cross multiply
   128,092.89x = 191,983.52 × 90,663.76
4. Step 4: Simplify right side
   128,092.89x = 17,405,946,657.98
5. Step 5: Solve for x
   x = 17,405,946,657.98/128,092.89
6. Step 6: Final answer
   x = 135,885.34