Finding the Fourth Proportional to 191,817.89, 264,702.62 and 105,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   191,817.89 : 264,702.62 = 105,780.50 : x
2. Step 2: Convert to fraction form
   191,817.89/264,702.62 = 105,780.50/x
3. Step 3: Cross multiply
   191,817.89x = 264,702.62 × 105,780.50
4. Step 4: Simplify right side
   191,817.89x = 28,000,373,642.49
5. Step 5: Solve for x
   x = 28,000,373,642.49/191,817.89
6. Step 6: Final answer
   x = 145,973.74