Finding the Fourth Proportional to 1,056.62, 1,583.60 and 561.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.62 : 1,583.60 = 561.80 : x
2. Step 2: Convert to fraction form
   1,056.62/1,583.60 = 561.80/x
3. Step 3: Cross multiply
   1,056.62x = 1,583.60 × 561.80
4. Step 4: Simplify right side
   1,056.62x = 889,667.63
5. Step 5: Solve for x
   x = 889,667.63/1,056.62
6. Step 6: Final answer
   x = 841.99