Finding the Fourth Proportional to 1,055.60, 1,577.50 and 947.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.60 : 1,577.50 = 947.19 : x
2. Step 2: Convert to fraction form
   1,055.60/1,577.50 = 947.19/x
3. Step 3: Cross multiply
   1,055.60x = 1,577.50 × 947.19
4. Step 4: Simplify right side
   1,055.60x = 1,494,189.86
5. Step 5: Solve for x
   x = 1,494,189.86/1,055.60
6. Step 6: Final answer
   x = 1,415.50