Finding the Fourth Proportional to 91,100.96, 136,845.68 and 85,774.40

Step by Step Solution

1. Step 1: Write the proportion equation
   91,100.96 : 136,845.68 = 85,774.40 : x
2. Step 2: Convert to fraction form
   91,100.96/136,845.68 = 85,774.40/x
3. Step 3: Cross multiply
   91,100.96x = 136,845.68 × 85,774.40
4. Step 4: Simplify right side
   91,100.96x = 11,737,856,094.59
5. Step 5: Solve for x
   x = 11,737,856,094.59/91,100.96
6. Step 6: Final answer
   x = 128,844.48