Finding the Fourth Proportional to 666,126, 918,152.78 and 496,298.16

Step by Step Solution

1. Step 1: Write the proportion equation
   666,126 : 918,152.78 = 496,298.16 : x
2. Step 2: Convert to fraction form
   666,126/918,152.78 = 496,298.16/x
3. Step 3: Cross multiply
   666,126x = 918,152.78 × 496,298.16
4. Step 4: Simplify right side
   666,126x = 455,677,535,312.89
5. Step 5: Solve for x
   x = 455,677,535,312.89/666,126
6. Step 6: Final answer
   x = 684,071.08