Finding the Fourth Proportional to 112,880.21, 155,779.45 and 64,490.10

Step by Step Solution

1. Step 1: Write the proportion equation
   112,880.21 : 155,779.45 = 64,490.10 : x
2. Step 2: Convert to fraction form
   112,880.21/155,779.45 = 64,490.10/x
3. Step 3: Cross multiply
   112,880.21x = 155,779.45 × 64,490.10
4. Step 4: Simplify right side
   112,880.21x = 10,046,231,925.80
5. Step 5: Solve for x
   x = 10,046,231,925.80/112,880.21
6. Step 6: Final answer
   x = 88,999.06