Finding the Fourth Proportional to 156,379.50, 215,981.91 and 105,991.02

Step by Step Solution

1. Step 1: Write the proportion equation
   156,379.50 : 215,981.91 = 105,991.02 : x
2. Step 2: Convert to fraction form
   156,379.50/215,981.91 = 105,991.02/x
3. Step 3: Cross multiply
   156,379.50x = 215,981.91 × 105,991.02
4. Step 4: Simplify right side
   156,379.50x = 22,892,142,942.45
5. Step 5: Solve for x
   x = 22,892,142,942.45/156,379.50
6. Step 6: Final answer
   x = 146,388.39