Finding the Fourth Proportional to 661,111.63, 991,667.35 and 436,419.42

Step by Step Solution

1. Step 1: Write the proportion equation
   661,111.63 : 991,667.35 = 436,419.42 : x
2. Step 2: Convert to fraction form
   661,111.63/991,667.35 = 436,419.42/x
3. Step 3: Cross multiply
   661,111.63x = 991,667.35 × 436,419.42
4. Step 4: Simplify right side
   661,111.63x = 432,782,884,761.60
5. Step 5: Solve for x
   x = 432,782,884,761.60/661,111.63
6. Step 6: Final answer
   x = 654,629.06