Finding the Fourth Proportional to 111,564, 153,774.72 and 77,621.76

Step by Step Solution

1. Step 1: Write the proportion equation
   111,564 : 153,774.72 = 77,621.76 : x
2. Step 2: Convert to fraction form
   111,564/153,774.72 = 77,621.76/x
3. Step 3: Cross multiply
   111,564x = 153,774.72 × 77,621.76
4. Step 4: Simplify right side
   111,564x = 11,936,264,409.91
5. Step 5: Solve for x
   x = 11,936,264,409.91/111,564
6. Step 6: Final answer
   x = 106,990.29