Finding the Fourth Proportional to 112,409.34, 155,130.78 and 64,669.86

Step by Step Solution

1. Step 1: Write the proportion equation
   112,409.34 : 155,130.78 = 64,669.86 : x
2. Step 2: Convert to fraction form
   112,409.34/155,130.78 = 64,669.86/x
3. Step 3: Cross multiply
   112,409.34x = 155,130.78 × 64,669.86
4. Step 4: Simplify right side
   112,409.34x = 10,032,285,824.29
5. Step 5: Solve for x
   x = 10,032,285,824.29/112,409.34
6. Step 6: Final answer
   x = 89,247.80